Crank shaft grinder



April 24, 1934. G. HERZOG 1,956,068

GRANK SHAFT GRINDER Filed Sept. 7, 1935 3 Sheets-Sheet l El E 45 GEORGE#l1-P206 April` 24, 1934. G. HERZOG CRANK SHAFT GRINDER Filed Sept. 7,1933 3 Sheets-Sheet 2 11mm'Il April 24, 1934. c,- HERZOG 1,956,068

CRANK SHAFT GRINDER Filed Sept. '7, 1935 3 Sheets-Sheet 3 e Il I l 2,/|..l HH h Li 4/ l iig" ww ,35 'UW 35 55 52 32, Z7 44 52a, 6, E z. E. 3,4o 5 4a GeoRef HERZOG Patented Apr. 24, 1934 fr srrss Claims.

This invention relates to a grinding machine and concerns itself with astructure in which the grinding element rotates in an orbit and alsoupon its own axis and in which a novel yielding 5 drive is provided forrotating the parts.

The invention comprises the novel structure and combinations of partshereinafter described and more particularly pointed out and dened in theappended claims.

In the accompanying drawings which illustrate a preferred form of thisinvention and in which similar reference numerals refer to similarfeatures in the different views,

Figure 1 is a top plan view of a machine involving this invention andshowing the same mounted upon a lathe.

Figure 2 is a side elevational view of the machine upon its mounting andshowing the article being ground in section.

Figure 3 is an enlarged side elevational view of the machine detachedfrom the lathe base.

Figure 4 is a sectional view taken upon the line IV--V of Figure 3looking in the direction of the arrows.

Figure 5 is an enlarged top plan view of the machine in detached form.

Figure 6 is an enlarged sectional view taken upon the line VI-V ofFigure 3 looking in the direction of the arrows.

Figure 7 is an enlarged sectional view taken upon the line VTI- VU ofFigure 3 looking in the direction of the arrows.

Figure 8 is an enlarged fragmentary sectional View of the machineillustrating certain features.

The grinding machine is shown in Figures 1 and 2 as mounted'upon a lathe1 which is provided With an ear 2 to which a lug 3 on one side of thecircular frame 4 of the grinding machine is pivoted. The opposite sideof the frame 4 is supported from the lathe by rods 5 and 6 connected bya turnbuckle 7. By adjusting the turnbuckle the frame 4 may becircumferentially adjusted to bring the same concentric with the article8 that is to be ground, and which in the present instance is illustratedas a bearing of a crank shaft supported by the lathe.

A cylindrical drum 9 is mounted interiorly of and concentric with theframe 4 as best shown in Figure 4. This drum has a peripheral flange 10spaced a short distance from the frame 4 and thrust bearing balls 11travel in a race way between the frame and flange. A pulley 12 isthreaded upon the drum 9 upon the opposite side of the frame 4 andfirmly secured by a screw 13. F55'NA Thrust bearing balls 14 travel in araceway formed between the frame 4 and pulley 12. The pulley 12 isprovided with a groove 15 for receiving a belt 16 whereby the drum maybe rotated.

The drum 9 is provided with a bracket 17 provided with a guideway 18 anda flange 19 in alinenient with the bracket. A slide 20 is mounted in theguideway 18. A screw 21 is rotatably anchored in a cap piece 22 upon thetop of the bracket. By rotating the screw, the slide 20 may be raised orlowered. Y A grinding wheel hanger 23 is removably secured te the slide26 by means of a bolt 24 whereby said hanger may be reversed to bringthe grinding wheel into a different plane as shown in Figure 8, afeature which may be desirable when grinding certain articles. Thehanger is inwardly offset and carries a stub shaft 25 upon which abushing 26 is secured. A grinding wheel 27 is journaled upon the bushingand this grinding wheel has a pulley 28 attached thereto which isjournalled upon the bushing by means 0f bearing balls 29. Y v

In order to retain the slide iirmly in the guide way 18 the latter ispreferably made in the form of a dovetail and the slide 20 iscorrespondingly fashioned, and a wear plate 30 (Figure 7) adapted to beadjusted by screws 31 is placed along one side Wall of the guide way toprevent any looseness between the slide and theV walls of the guideway.Y

A pair of radially extending brackets-32 are adjustably `attached to theflange 19. These brackets have outwardly ciset portions 32a as bestshown in Figure 6. A shaft 33 is secured to each bracket, and a sleevebearing 34 is secured upon such shaft. A pulley 35 is journalled uponeach sleeve bearing 34 by means oi ball bearings 36'. The pulley has anoil duct 37 that extends to the ball bearing and that communicates withan oil hole 38 normally closed by a plug 39. Each pulley 35 has a pairof belt grooves 40.

A plurality of pulleys 41 are journalled upon studs 42 extending fromone side of the cylindrical frame 4 as shown in Figures 3 and 4. Thepulleys are preferably mounted upon ball bearings as shown in Figure 4.Each pulley 41 has a pair of belt grooves 43 as best shown in Figure 4.

It will be noted that one groove in each pulley 35 is in alinement withthe groove in the pulley 28 on the grinding element 27 for receiving thedriving belt 44 for the grinding element. This belt merely travels overthe pulleys 35 and the pulley 28 and to maintain the same taut, atensioning pulley 45 is mounted upon an adjustable arm 46 upon one ofthe brackets 32 (Figure 2).

The drum 9 is adapted to be rotated by the belt 16 which surrounds apulley 4'7 (Figure 1) on the shaft of a driving motor 43.

A second driving motor 49 is mounted opposite the motor 48 and the shaft50 of this motor carries a pulley 51 for driving a belt 52 trained overthe pulleys 41 and imparts rotation thereto. It will be noted that thebelt 52 travels in the farside grooves of the pulleys 41.

A fourth belt 53 is trained over the pulleys 35 and 41 and travels inthe farside grooves of pulleys 35 and the near side grooves in thepulleys 41 as viewed in Figure 3.

In the operation of the machine, the motor 48 will cause the rotation ofthe drum and carry the grinding element 27 around the article to beground and in a circular orbit. rIhe driving motor 49 rotates thepulleys 41 upon the stationary ring frame 4 and cause the rotationthereby of the belt 53 for rotating pulleys 35 which in turn rotate thebelt 44 for rotating the grinding element 27 as it travels in itscircular orbital path. Thus it will be apparent that the article actedupon will be uniformly ground into true circular form.

It will be appreciated that this novel grinding machine avoids the useof gears and utilizes instead a system of belting which is more or lessflexible in use as a certain amount of yield or slippage may take place.It will be further evident that due to the adjustable feature of thering frame, it is always possible to have the same concentric with thearticle to be ground.

I am aware that many changes may be made and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I, therefore, do not purposelimiting the patent i granted hereon otherwise than necessitated by theprior art.

I claim as my invention:

1. In a grinding machine, a normally stationary ring-like frame, acylindrical member associated with said frame for rotation with respectthereto, an adjustable hanger carried by saggi member, a grindingelement journalled upon said hanger, pulleys upon said member, a pulleyattached to said grinding element, a belt trained over said pulleys andsaid pulley on the grinding element, pulleys mounted upon said frame, abelt trained over the pulleys on said frame and over the rst mentionedpulleys, means for driving the last mentioned belt and means forrotating said cylindrical member.

2. In a grinding machine, a supporting base, a ring-like frame supportedupon said base for circumferential adjustments, a rotatable memberjournalled upon said frame, a hanger on said member, a grinding elementjournalled upon said hanger, a pair of brackets extending radially fromsaid rotatable member, pulleys upon said brackets, a grinding elementjournalled upon said hanger, a pulley associated with said grindingelement, a belt trained over the pulleys on said brackets and over thelast mentioned pulley, pulleys journalled upon said ring-like frame, abelt surrounding the last mentioned pulleys and the pulleys on saidbrackets, means for driving the last mentioned belt and means forrotating said member.

3. In a grinding machine, a supporting base, a ring-like frame pivotedupon said base, means for adjusting said frame, a cylindrical memberjournalled in said frame for rotational movements, a hanger carried bysaid member, a grinding element carried by said hanger, a pulleyattached to said grinding element, pulleys upon said cylindrical member,a belt trained over said pulley and pulleys, pulleys upon said ring-likeframe, a belt trained over said last mentioned pulleys and the pulleysupon said member, a third belt trained over the pulleys upon saidring-like frame, means for driving said third belt, and means forrotating said cylindrical member.

4. In a grinding machine, a frame having a circular bearing, acylindrical member journalled in said bearing, a grinding elementcarried by said member, a pulley attached to said grinding element,pulleys upon said member, a belt trained over said pulley and pulleys,pulleys upon said frame, a belt trained over the pulleys on said frameand on said member, means for rotating said cylindrical member, meansfor rotating the pulleys on said frame for operating the belt thereonand the rst mentioned belt, and means for adjusting said frame.

5. In a grinding machine, a supporting base, a ring-like frame pivotedto said supporting base for arcuate adjustment, a rotatable cylindricalmember associated with said ring-like frame, means for rotating saidmember, a bracket carried by said member and extending toward the centerthereof, a grinding element rotatably mounted upon said bracket, pulleysmounted upon said rotatable cylindrical member, a pulley attached tosaid grinding element, a'belt trained over said pulleys and pulley,pulleys mounted around said ring-like frame, a secondr belt trained overthe pulleys on said frame and the pulleys on said rotatable member, anda motor driven belt'trained over the pulleys on said frame for operatingthe same for driving said second belt.

GEORGE HERZOG.

